DE2525486C2 - DF device with two-channel Watson-Watt receiver - Google Patents

Description

30th

The invention relates to a test device in the preamble of claim I specified type.

It is known that interfering fields cause DF errors, the magnitude of which depends on the ratio Γ of the antenna system diameter α to the wavelength /. of the electromagnetic waves to be tracked depends in such a way that the error turns out to be greater, the smaller the ratio Γ of the system used. Klcingrundpeilcr. That is, direction finders with V < 1. therefore also have relatively large bearing errors, while the disadvantage of large base pilers (''> I) is that their bearing values can be ambiguous, since the antenna diameter is greater than the direction of the wave length.

A direction finding system is known from IS-PS 31 18 141 in which a rough bearing is carried out by means of an Adcock as a small base system. With the results this coarse bearing and separately obtained information about the elevation angle of the bearing to be tracked Wave is controlled by a voltage generator that marks a bearing mark on the screen of a display tube generated. A bearing figure is shown on the same screen, which is made up of the output voltages a two-channel receiver. which is connected to a large base monitor antenna. results. the The bearing marking can be adjusted in its angular position by turning an adjusting knob on the voltage generator be rotated so that it coincides with the bearing figure. The desired bearing angle can then be read off on a scale on the setting knob. This well-known The direction finder works through the large-scale interfcrometer system with great accuracy, but it is easy to operate and thanks to the two separate direction finding systems quite complex to build.

A direction finding device with two piled up one inside the other Antenna groups of different sizes are also known from DE-PS 1081078. The two different Antenna groups are provided to enable reception in two different frequency ranges. Optionally, one of the antenna groups can be connected to a broadband receiver.

The invention is based on the object of a Peileinnchtung specify the type mentioned in the preamble of claim 1, which with little operating and device expenditure delivers clear bearing values with the accuracy of large basic bearing systems.

The invention is described in claim 1. The subclaims contain advantageous designs the invention.

The essence of the invention consists in a cost-saving combination of the advantages of the small and of the large base direction finder while avoiding the mutual disadvantages. This is achieved by initially using a small base direction finder a clear Coarse bearing is carried out, the accuracy of which is then sought by means of a large base calculator Dimension is increased, whereby the same devices are used for small and large base direction finders if possible.

To correct the display on the display tube, one is controlled by the arithmetic unit's corrections Tracking device used for the display tube or its azimuth scale.

According to a favorable embodiment, the writing beam of the display tube is connected to the switching device connected load line for the duration of the connection of the large base DF antenna can be switched off at the two-channel Watson-Watt receiver.

In the following, a preferred embodiment will now be explained in more detail with reference to FIGS. 1 and 2. FIG. Fig. 1 shows an Adcock arrangement. consisting of a small base adcock 1 to 4 and one to this concentrically arranged large base adcock 5 to 8. The individual antennas 1 to 8 are all constructed similarly are.

The bearing voltages

ν = A ■ sin <·>! ■ sin

(ka \

A ■ sin οι ■ ^ cos α

^k "

IKa \ . χα.

• = A ■ sin wi · sin I _Ί sin 2 j * A ■ sin 0 / · - sin α

(Dun

of the small base adapter (diameter = ti) as well as the bearing voltages

kh

.ν '= / 1 · sin c </ · sin I, cos

■ · ■ ■ ( ^kh ■ \

y = A ■ sin oil · sin I _Ί sin 2 I

of the large base adapter (diameter = / ·) are connected to connections 9 and 9 'as well as 10 and 10 ″ of a switching device 11 shown in FIG. 2 (A = amplitude.

k = ~, = wave number). The switching device switches the DF voltages ν and ν of the small base adapter through to the inputs of a two-channel Watson-Watt receiver 12, so that the usual DF figure with the coarse bearing 2, is displayed on a display tube 14 via a deadening sound system 13. At the same time, the output voltages of the Watson-Watt receiver are transmitted via an analog-digital converter 16 - each consisting of two sample and hold

circuits with downstream actual analog, Digital converters - fed to an arithmetic unit 17 which - controlled via a line 21 - divides ν by ν and in this way tan a "or a" is determined and stored.

Then briefly, while the write beam of the display tube is switched off via a blanking line 15. the DF voltages x ' and i' of the large base adcock are switched through to the Watson-Watt receiver, digitized and fed to the arithmetic unit «. Of the

now determined quotient B =
the relationship

, is identical to

B =

. (kh. \
sin I - sin α 1

• T ^kh \ '

sin I - cos α 1

where the corrected bearing angle X = -χ ,, + Ax appearing here is equal to the sum of the coarse bearing a "and a correction Δα yet to be determined. The above relation can be converted into the relation with a small Ax

t ^kh \ » ■ ( ^kh ■ \
Mil I., Α>·> ϊ ,, J - β - Mn (, sin y " I

^{V /} * ikh \ kh . (kh . \ Aft

CO-. I, ClK 2 "I · _Ί ΜΠ I ₁₁ T Ii CIh I ^ sill 7" I ^ CO-

transform, with the help of which the correction value Δ ζ in the ίο arithmetic unit is determined. In order to determine the wave number A required for this, the arithmetic unit is transmitted from the Watson-Watt receiver via a frequency signal 20 to the frequency of the electromagnetic waves that have been tracked. The determined correction value Δα is fed via an output 18 of the arithmetic unit to a tracking device 18 ', with the aid of which, for example, the azimuth scale on the display tube is rotated so that the corrected bearing angle x = x _o + Ax is displayed. At the same time, the corrected PeiKvinkel is output via an output 19 of the arithmetic unit.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. DF device with a small base DF antenna for coarse bearing and a large base DF antenna for more accurate bearing and with a two-channel Watson-Watt receiver with display tube, characterized by a switching device (II). by means of the large base DF antenna (5 to 8) instead of the small base DF antenna (ί to 4) to the receiver (12) can be switched on. and by an arithmetic unit (17). that - controlled by the switching device - the coarse bearing from the DF voltages of the small base antenna and from the DF voltages a correction value for the large base DF antenna; 5 determined for the rough bearing. 2. direction finding device according to claim 1, characterized in that that a blanking line (15) is provided through which the writing beam of the display tube (14) in each case for the duration of the connection of the large base M DF antenna to the two-channel Watson-Waii receiver can be cut off. 3. direction finding device according to claim 1 or 2, characterized in that one of the correction weirt Arithmetic unit-controlled tracking device (18 ") provided for the display tube or its azimuth scale is.